38268621681 has 32 divisors (see below), whose sum is σ = 54645050880. Its totient is φ = 23737245696.

The previous prime is 38268621679. The next prime is 38268621683. The reversal of 38268621681 is 18612686283.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (38268621679) and next prime (38268621683).

It is not a de Polignac number, because 38268621681 - 2¹ = 38268621679 is a prime.

It is a super-2 number, since 2×38268621681² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (38268621683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4928280 + ... + 4936038.

It is an arithmetic number, because the mean of its divisors is an integer number (1707657840).

Almost surely, 2^38268621681 is an apocalyptic number.

It is an amenable number.

38268621681 is a deficient number, since it is larger than the sum of its proper divisors (16376429199).

38268621681 is a wasteful number, since it uses less digits than its factorization.

38268621681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8873.

The product of its digits is 1327104, while the sum is 51.

The spelling of 38268621681 in words is "thirty-eight billion, two hundred sixty-eight million, six hundred twenty-one thousand, six hundred eighty-one".