77855147999 has 4 divisors (see below), whose sum is σ = 78142436640. Its totient is φ = 77567859360.

The previous prime is 77855147987. The next prime is 77855148031. The reversal of 77855147999 is 99974155877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99974155877 = 20939 ⋅4774543.

It is a cyclic number.

It is not a de Polignac number, because 77855147999 - 2¹² = 77855143903 is a prime.

It is a super-2 number, since 2×77855147999² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77855147939) 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, 143643914 + ... + 143644455.

It is an arithmetic number, because the mean of its divisors is an integer number (19535609160).

Almost surely, 2^77855147999 is an apocalyptic number.

77855147999 is a deficient number, since it is larger than the sum of its proper divisors (287288641).

77855147999 is a wasteful number, since it uses less digits than its factorization.

77855147999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287288640.

The product of its digits is 200037600, while the sum is 71.

The spelling of 77855147999 in words is "seventy-seven billion, eight hundred fifty-five million, one hundred forty-seven thousand, nine hundred ninety-nine".