37115491644 has 576 divisors, whose sum is σ = 128012451840. Its totient is φ = 8781696000.

The previous prime is 37115491643. The next prime is 37115491769. The reversal of 37115491644 is 44619451173.

37115491644 is a `hidden beast` number, since 3 + 7 + 115 + 491 + 6 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 37115491644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37115491643) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 175902699 + ... + 175902909.

It is an arithmetic number, because the mean of its divisors is an integer number (222243840).

Almost surely, 2^37115491644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 37115491644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64006225920).

37115491644 is an abundant number, since it is smaller than the sum of its proper divisors (90896960196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

37115491644 is a wasteful number, since it uses less digits than its factorization.

37115491644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 377 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 37115491644 in words is "thirty-seven billion, one hundred fifteen million, four hundred ninety-one thousand, six hundred forty-four".