91078779796 has 6 divisors (see below), whose sum is σ = 159387864650. Its totient is φ = 45539389896.

The previous prime is 91078779749. The next prime is 91078779817. The reversal of 91078779796 is 69797787019.

It can be written as a sum of positive squares in only one way, i.e., 61093008900 + 29985770896 = 247170^2 + 173164^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11384847471 + ... + 11384847478.

Almost surely, 2^91078779796 is an apocalyptic number.

It is an amenable number.

91078779796 is a deficient number, since it is larger than the sum of its proper divisors (68309084854).

91078779796 is a wasteful number, since it uses less digits than its factorization.

91078779796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22769694953 (or 22769694951 counting only the distinct ones).

The product of its (nonzero) digits is 84015792, while the sum is 70.

The spelling of 91078779796 in words is "ninety-one billion, seventy-eight million, seven hundred seventy-nine thousand, seven hundred ninety-six".