2151398661504 has 128 divisors (see below), whose sum is σ = 5768171261280. Its totient is φ = 710423347200.

The previous prime is 2151398661437. The next prime is 2151398661539. The reversal of 2151398661504 is 4051668931512.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92717104 + ... + 92740304.

Almost surely, 2^{2151398661504} is an apocalyptic number.

2151398661504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151398661504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2884085630640).

2151398661504 is an abundant number, since it is smaller than the sum of its proper divisors (3616772599776).

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

2151398661504 is a wasteful number, since it uses less digits than its factorization.

2151398661504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25468 (or 25456 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 2151398661504 in words is "two trillion, one hundred fifty-one billion, three hundred ninety-eight million, six hundred sixty-one thousand, five hundred four".