3992364651661 has 8 divisors (see below), whose sum is σ = 4207957539480. Its totient is φ = 3781966773312.

The previous prime is 3992364651637. The next prime is 3992364651679. The reversal of 3992364651661 is 1661564632993.

It can be written as a sum of positive squares in 4 ways, for example, as 894359838436 + 3098004813225 = 945706^2 + 1760115^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3992364651661 - 2²³ = 3992356263053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3992364651661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992364651161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1298750790 + ... + 1298753863.

It is an arithmetic number, because the mean of its divisors is an integer number (525994692435).

Almost surely, 2^{3992364651661} is an apocalyptic number.

It is an amenable number.

3992364651661 is a deficient number, since it is larger than the sum of its proper divisors (215592887819).

3992364651661 is a wasteful number, since it uses less digits than its factorization.

3992364651661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597504735.

The product of its digits is 37791360, while the sum is 61.

It can be divided in two parts, 3992364 and 651661, that added together give a square (4644025 = 2155²).

The spelling of 3992364651661 in words is "three trillion, nine hundred ninety-two billion, three hundred sixty-four million, six hundred fifty-one thousand, six hundred sixty-one".