916737440621 has 4 divisors (see below), whose sum is σ = 920848371072. Its totient is φ = 912626510172.

The previous prime is 916737440561. The next prime is 916737440629. The reversal of 916737440621 is 126044737619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126044737619 = 751 ⋅167835869.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916737440621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 916737440621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916737440629) 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, 2055464891 + ... + 2055465336.

It is an arithmetic number, because the mean of its divisors is an integer number (230212092768).

Almost surely, 2^916737440621 is an apocalyptic number.

It is an amenable number.

916737440621 is a deficient number, since it is larger than the sum of its proper divisors (4110930451).

916737440621 is a wasteful number, since it uses less digits than its factorization.

916737440621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110930450.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 916737440621 in words is "nine hundred sixteen billion, seven hundred thirty-seven million, four hundred forty thousand, six hundred twenty-one".