38961918641 has 8 divisors (see below), whose sum is σ = 39110898024. Its totient is φ = 38813195520.

The previous prime is 38961918629. The next prime is 38961918661. The reversal of 38961918641 is 14681916983.

It can be written as a sum of positive squares in 4 ways, for example, as 11166360241 + 27795558400 = 105671^2 + 166720^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38961918641 is a prime.

It is a super-2 number, since 2×38961918641² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38961918661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243401 + ... + 370361.

It is an arithmetic number, because the mean of its divisors is an integer number (4888862253).

Almost surely, 2^38961918641 is an apocalyptic number.

It is an amenable number.

38961918641 is a deficient number, since it is larger than the sum of its proper divisors (148979383).

38961918641 is a wasteful number, since it uses less digits than its factorization.

38961918641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128131.

The product of its digits is 2239488, while the sum is 56.

The spelling of 38961918641 in words is "thirty-eight billion, nine hundred sixty-one million, nine hundred eighteen thousand, six hundred forty-one".