158909777691 has 16 divisors (see below), whose sum is σ = 249959467008. Its totient is φ = 87876374400.

The previous prime is 158909777683. The next prime is 158909777701. The reversal of 158909777691 is 196777909851.

It is not a de Polignac number, because 158909777691 - 2³ = 158909777683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158909772691) 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, 122049870 + ... + 122051171.

It is an arithmetic number, because the mean of its divisors is an integer number (15622466688).

Almost surely, 2^158909777691 is an apocalyptic number.

158909777691 is a deficient number, since it is larger than the sum of its proper divisors (91049689317).

158909777691 is a wasteful number, since it uses less digits than its factorization.

158909777691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244101082.

The product of its (nonzero) digits is 60011280, while the sum is 69.

The spelling of 158909777691 in words is "one hundred fifty-eight billion, nine hundred nine million, seven hundred seventy-seven thousand, six hundred ninety-one".