1366401537 has 36 divisors (see below), whose sum is σ = 2115629100. Its totient is φ = 849580032.

The previous prime is 1366401481. The next prime is 1366401541. The reversal of 1366401537 is 7351046631.

1366401537 is a `hidden beast` number, since 1 + 3 + 6 + 640 + 1 + 5 + 3 + 7 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 110691441 + 1255710096 = 10521^2 + 35436^2 .

It is not a de Polignac number, because 1366401537 - 2¹² = 1366397441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1366401637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 291589 + ... + 296237.

It is an arithmetic number, because the mean of its divisors is an integer number (58767475).

Almost surely, 2^1366401537 is an apocalyptic number.

1366401537 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1366401537 is a deficient number, since it is larger than the sum of its proper divisors (749227563).

1366401537 is a wasteful number, since it uses less digits than its factorization.

1366401537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4802 (or 4782 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 1366401537 is about 36964.8689568893. The cubic root of 1366401537 is about 1109.6672803609.

It can be divided in two parts, 1366401 and 537, that multiplied together give a palindrome (733757337).

The spelling of 1366401537 in words is "one billion, three hundred sixty-six million, four hundred one thousand, five hundred thirty-seven".