1366850551 has 4 divisors (see below), whose sum is σ = 1491109704. Its totient is φ = 1242591400.

The previous prime is 1366850521. The next prime is 1366850561. The reversal of 1366850551 is 1550586631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1550586631 = 11 ⋅140962421.

It is a cyclic number.

It is not a de Polignac number, because 1366850551 - 2⁷ = 1366850423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366850501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62129560 + ... + 62129581.

It is an arithmetic number, because the mean of its divisors is an integer number (372777426).

Almost surely, 2^1366850551 is an apocalyptic number.

1366850551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1366850551 is a deficient number, since it is larger than the sum of its proper divisors (124259153).

1366850551 is a wasteful number, since it uses less digits than its factorization.

1366850551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124259152.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 1366850551 is about 36970.9419815076. The cubic root of 1366850551 is about 1109.7888165183.

The spelling of 1366850551 in words is "one billion, three hundred sixty-six million, eight hundred fifty thousand, five hundred fifty-one".