2391521975655 has 8 divisors (see below), whose sum is σ = 3826435161072. Its totient is φ = 1275478387008.

The previous prime is 2391521975639. The next prime is 2391521975663. The reversal of 2391521975655 is 5565791251932.

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

It is not a de Polignac number, because 2391521975655 - 2⁴ = 2391521975639 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, 79717399174 + ... + 79717399203.

It is an arithmetic number, because the mean of its divisors is an integer number (478304395134).

Almost surely, 2^{2391521975655} is an apocalyptic number.

2391521975655 is a deficient number, since it is larger than the sum of its proper divisors (1434913185417).

2391521975655 is a wasteful number, since it uses less digits than its factorization.

2391521975655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159434798385.

The product of its digits is 25515000, while the sum is 60.

The spelling of 2391521975655 in words is "two trillion, three hundred ninety-one billion, five hundred twenty-one million, nine hundred seventy-five thousand, six hundred fifty-five".