36501990691 has 4 divisors (see below), whose sum is σ = 38649166632. Its totient is φ = 34354814752.

The previous prime is 36501990673. The next prime is 36501990697. The reversal of 36501990691 is 19609910563.

36501990691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19609910563 = 17387 ⋅1127849.

It is not a de Polignac number, because 36501990691 - 2⁹ = 36501990179 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36501990697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073587945 + ... + 1073587978.

It is an arithmetic number, because the mean of its divisors is an integer number (9662291658).

Almost surely, 2^36501990691 is an apocalyptic number.

36501990691 is a deficient number, since it is larger than the sum of its proper divisors (2147175941).

36501990691 is a wasteful number, since it uses less digits than its factorization.

36501990691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147175940.

The product of its (nonzero) digits is 393660, while the sum is 49.

The spelling of 36501990691 in words is "thirty-six billion, five hundred one million, nine hundred ninety thousand, six hundred ninety-one".