3994650656501 has 4 divisors (see below), whose sum is σ = 3995953121472. Its totient is φ = 3993348191532.

The previous prime is 3994650656483. The next prime is 3994650656537. The reversal of 3994650656501 is 1056560564993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3994650656501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994650676501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651227885 + ... + 651234018.

It is an arithmetic number, because the mean of its divisors is an integer number (998988280368).

Almost surely, 2^{3994650656501} is an apocalyptic number.

It is an amenable number.

3994650656501 is a deficient number, since it is larger than the sum of its proper divisors (1302464971).

3994650656501 is a wasteful number, since it uses less digits than its factorization.

3994650656501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302464970.

The product of its (nonzero) digits is 26244000, while the sum is 59.

The spelling of 3994650656501 in words is "three trillion, nine hundred ninety-four billion, six hundred fifty million, six hundred fifty-six thousand, five hundred one".