7949155645 has 8 divisors (see below), whose sum is σ = 9771645240. Its totient is φ = 6204218880.

The previous prime is 7949155619. The next prime is 7949155661. The reversal of 7949155645 is 5465519497.

It can be written as a sum of positive squares in 4 ways, for example, as 321054724 + 7628100921 = 17918^2 + 87339^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-7949155645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19387980 + ... + 19388389.

It is an arithmetic number, because the mean of its divisors is an integer number (1221455655).

Almost surely, 2^7949155645 is an apocalyptic number.

It is an amenable number.

7949155645 is a deficient number, since it is larger than the sum of its proper divisors (1822489595).

7949155645 is a wasteful number, since it uses less digits than its factorization.

7949155645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38776415.

The product of its digits is 6804000, while the sum is 55.

The square root of 7949155645 is about 89158.0374671852. The cubic root of 7949155645 is about 1995.7539623782.

The spelling of 7949155645 in words is "seven billion, nine hundred forty-nine million, one hundred fifty-five thousand, six hundred forty-five".