91437693650 has 24 divisors (see below), whose sum is σ = 174222263124. Its totient is φ = 35683001600.

The previous prime is 91437693499. The next prime is 91437693661. The reversal of 91437693650 is 5639673419.

It can be written as a sum of positive squares in 6 ways, for example, as 9204675481 + 82233018169 = 95941^2 + 286763^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91437693592 and 91437693601.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22299827 + ... + 22303926.

Almost surely, 2^91437693650 is an apocalyptic number.

91437693650 is a deficient number, since it is larger than the sum of its proper divisors (82784569474).

91437693650 is a wasteful number, since it uses less digits than its factorization.

91437693650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44603806 (or 44603801 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 53.

It can be divided in two parts, 9143769 and 3650, that added together give a palindrome (9147419).

The spelling of 91437693650 in words is "ninety-one billion, four hundred thirty-seven million, six hundred ninety-three thousand, six hundred fifty".