38021791945 has 16 divisors (see below), whose sum is σ = 46361213712. Its totient is φ = 29929374720.

The previous prime is 38021791943. The next prime is 38021791961. The reversal of 38021791945 is 54919712083.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3845984256 + 34175807689 = 62016^2 + 184867^2 .

It is not a de Polignac number, because 38021791945 - 2¹ = 38021791943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38021791943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29949 + ... + 277381.

It is an arithmetic number, because the mean of its divisors is an integer number (2897575857).

Almost surely, 2^38021791945 is an apocalyptic number.

It is an amenable number.

38021791945 is a deficient number, since it is larger than the sum of its proper divisors (8339421767).

38021791945 is a wasteful number, since it uses less digits than its factorization.

38021791945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247932.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 38021791945 in words is "thirty-eight billion, twenty-one million, seven hundred ninety-one thousand, nine hundred forty-five".