91939155251956 has 24 divisors (see below), whose sum is σ = 173304662920704. Its totient is φ = 42552484196640.

The previous prime is 91939155251953. The next prime is 91939155251959. The reversal of 91939155251956 is 65915255193919.

It is an interprime number because it is at equal distance from previous prime (91939155251953) and next prime (91939155251959).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939155251953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16118362375 + ... + 16118368078.

It is an arithmetic number, because the mean of its divisors is an integer number (7221027621696).

Almost surely, 2^{91939155251956} is an apocalyptic number.

It is an amenable number.

91939155251956 is a deficient number, since it is larger than the sum of its proper divisors (81365507668748).

91939155251956 is a wasteful number, since it uses less digits than its factorization.

91939155251956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32236730511 (or 32236730509 counting only the distinct ones).

The product of its digits is 147622500, while the sum is 70.

The spelling of 91939155251956 in words is "ninety-one trillion, nine hundred thirty-nine billion, one hundred fifty-five million, two hundred fifty-one thousand, nine hundred fifty-six".