1264137855 has 32 divisors (see below), whose sum is σ = 2067225600. Its totient is φ = 659498112.

The previous prime is 1264137839. The next prime is 1264137881. The reversal of 1264137855 is 5587314621.

It is a happy number.

It is not a de Polignac number, because 1264137855 - 2⁴ = 1264137839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124272 + ... + 134058.

It is an arithmetic number, because the mean of its divisors is an integer number (64600800).

Almost surely, 2^1264137855 is an apocalyptic number.

1264137855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1264137855 is a deficient number, since it is larger than the sum of its proper divisors (803087745).

1264137855 is a wasteful number, since it uses less digits than its factorization.

1264137855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983.

The product of its digits is 201600, while the sum is 42.

The square root of 1264137855 is about 35554.7163538116. The cubic root of 1264137855 is about 1081.2633407199.

The spelling of 1264137855 in words is "one billion, two hundred sixty-four million, one hundred thirty-seven thousand, eight hundred fifty-five".