3958700663781 has 80 divisors (see below), whose sum is σ = 6029832796416. Its totient is φ = 2587819497984.

The previous prime is 3958700663693. The next prime is 3958700663791. The reversal of 3958700663781 is 1873660078593.

3958700663781 is a `hidden beast` number, since 395 + 87 + 0 + 0 + 66 + 37 + 81 = 666.

It is not a de Polignac number, because 3958700663781 - 2²¹ = 3958698566629 is a prime.

It is a super-2 number, since 2×3958700663781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3958700663791) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1633800136 + ... + 1633802558.

Almost surely, 2^{3958700663781} is an apocalyptic number.

It is an amenable number.

3958700663781 is a deficient number, since it is larger than the sum of its proper divisors (2071132132635).

3958700663781 is a wasteful number, since it uses less digits than its factorization.

3958700663781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384 (or 4375 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 3958700663781 in words is "three trillion, nine hundred fifty-eight billion, seven hundred million, six hundred sixty-three thousand, seven hundred eighty-one".