655615721272 has 8 divisors (see below), whose sum is σ = 1229279477400. Its totient is φ = 327807860632.

The previous prime is 655615721263. The next prime is 655615721287. The reversal of 655615721272 is 272127516556.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40975982572 + ... + 40975982587.

It is an arithmetic number, because the mean of its divisors is an integer number (153659934675).

Almost surely, 2^655615721272 is an apocalyptic number.

It is an amenable number.

655615721272 is a deficient number, since it is larger than the sum of its proper divisors (573663756128).

655615721272 is a wasteful number, since it uses less digits than its factorization.

655615721272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81951965165 (or 81951965161 counting only the distinct ones).

The product of its digits is 1764000, while the sum is 49.

The spelling of 655615721272 in words is "six hundred fifty-five billion, six hundred fifteen million, seven hundred twenty-one thousand, two hundred seventy-two".