15215220700655 has 4 divisors (see below), whose sum is σ = 18258264840792. Its totient is φ = 12172176560520.

The previous prime is 15215220700651. The next prime is 15215220700657. The reversal of 15215220700655 is 55600702251251.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15215220700655 - 2² = 15215220700651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15215220700651) 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, 1521522070061 + ... + 1521522070070.

It is an arithmetic number, because the mean of its divisors is an integer number (4564566210198).

Almost surely, 2^{15215220700655} is an apocalyptic number.

15215220700655 is a deficient number, since it is larger than the sum of its proper divisors (3043044140137).

15215220700655 is an equidigital number, since it uses as much as digits as its factorization.

15215220700655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043044140136.

The product of its (nonzero) digits is 210000, while the sum is 41.

The spelling of 15215220700655 in words is "fifteen trillion, two hundred fifteen billion, two hundred twenty million, seven hundred thousand, six hundred fifty-five".