2151398661534 has 24 divisors (see below), whose sum is σ = 4661407508472. Its totient is φ = 717126157680.

The previous prime is 2151398661437. The next prime is 2151398661539. The reversal of 2151398661534 is 4351668931512.

2151398661534 is a `hidden beast` number, since 2 + 1 + 5 + 13 + 9 + 8 + 6 + 615 + 3 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151398661539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1645204 + ... + 2647544.

It is an arithmetic number, because the mean of its divisors is an integer number (194225312853).

Almost surely, 2^{2151398661534} is an apocalyptic number.

2151398661534 is an abundant number, since it is smaller than the sum of its proper divisors (2510008846938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151398661534 is a wasteful number, since it uses less digits than its factorization.

2151398661534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121592 (or 1121589 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 2151398661534 in words is "two trillion, one hundred fifty-one billion, three hundred ninety-eight million, six hundred sixty-one thousand, five hundred thirty-four".