155777691 has 16 divisors (see below), whose sum is σ = 212938880. Its totient is φ = 101243520.

The previous prime is 155777683. The next prime is 155777701. The reversal of 155777691 is 196777551.

It is not a de Polignac number, because 155777691 - 2³ = 155777683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155777691.

It is not an unprimeable number, because it can be changed into a prime (155777191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103875 + ... + 105363.

It is an arithmetic number, because the mean of its divisors is an integer number (13308680).

Almost surely, 2^155777691 is an apocalyptic number.

155777691 is a deficient number, since it is larger than the sum of its proper divisors (57161189).

155777691 is a wasteful number, since it uses less digits than its factorization.

155777691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346.

The product of its digits is 463050, while the sum is 48.

The square root of 155777691 is about 12481.0933415306. The cubic root of 155777691 is about 538.0654266925.

The spelling of 155777691 in words is "one hundred fifty-five million, seven hundred seventy-seven thousand, six hundred ninety-one".