77954469091 has 4 divisors (see below), whose sum is σ = 80061346672. Its totient is φ = 75847591512.

The previous prime is 77954469053. The next prime is 77954469101. The reversal of 77954469091 is 19096445977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77954469091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77954469001) 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, 1053438735 + ... + 1053438808.

It is an arithmetic number, because the mean of its divisors is an integer number (20015336668).

Almost surely, 2^77954469091 is an apocalyptic number.

77954469091 is a deficient number, since it is larger than the sum of its proper divisors (2106877581).

77954469091 is a wasteful number, since it uses less digits than its factorization.

77954469091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106877580.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 77954469091 in words is "seventy-seven billion, nine hundred fifty-four million, four hundred sixty-nine thousand, ninety-one".