6556772515 has 8 divisors (see below), whose sum is σ = 7893266688. Its totient is φ = 5228658240.

The previous prime is 6556772513. The next prime is 6556772527. The reversal of 6556772515 is 5152776556.

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

It is not a de Polignac number, because 6556772515 - 2¹ = 6556772513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556772513) 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, 2093251 + ... + 2096380.

It is an arithmetic number, because the mean of its divisors is an integer number (986658336).

Almost surely, 2^6556772515 is an apocalyptic number.

6556772515 is a deficient number, since it is larger than the sum of its proper divisors (1336494173).

6556772515 is a wasteful number, since it uses less digits than its factorization.

6556772515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189949.

The product of its digits is 2205000, while the sum is 49.

The square root of 6556772515 is about 80973.9002086475. The cubic root of 6556772515 is about 1871.6732728228.

The spelling of 6556772515 in words is "six billion, five hundred fifty-six million, seven hundred seventy-two thousand, five hundred fifteen".