6644157477049 has 4 divisors (see below), whose sum is σ = 6649164379264. Its totient is φ = 6639150574836.

The previous prime is 6644157477017. The next prime is 6644157477059. The reversal of 6644157477049 is 9407747514466.

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 not a de Polignac number, because 6644157477049 - 2⁵ = 6644157477017 is a prime.

It is a super-2 number, since 2×6644157477049² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644157477059) 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, 2503449117 + ... + 2503451770.

It is an arithmetic number, because the mean of its divisors is an integer number (1662291094816).

Almost surely, 2^{6644157477049} is an apocalyptic number.

It is an amenable number.

6644157477049 is a deficient number, since it is larger than the sum of its proper divisors (5006902215).

6644157477049 is a wasteful number, since it uses less digits than its factorization.

6644157477049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006902214.

The product of its (nonzero) digits is 142248960, while the sum is 64.

The spelling of 6644157477049 in words is "six trillion, six hundred forty-four billion, one hundred fifty-seven million, four hundred seventy-seven thousand, forty-nine".