15257121455442 has 16 divisors (see below), whose sum is σ = 30514294313280. Its totient is φ = 5085698584752.

The previous prime is 15257121455423. The next prime is 15257121455531. The reversal of 15257121455442 is 24455412175251.

It is a super-2 number, since 2×15257121455442² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15257121455391 and 15257121455400.

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, 2486059 + ... + 6057617.

It is an arithmetic number, because the mean of its divisors is an integer number (1907143394580).

Almost surely, 2^{15257121455442} is an apocalyptic number.

15257121455442 is an abundant number, since it is smaller than the sum of its proper divisors (15257172857838).

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

15257121455442 is a wasteful number, since it uses less digits than its factorization.

15257121455442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283537.

The product of its digits is 2240000, while the sum is 48.

It can be divided in two parts, 152571214 and 55442, that added together give a triangular number (152626656 = T₁₇₄₇₁).

The spelling of 15257121455442 in words is "fifteen trillion, two hundred fifty-seven billion, one hundred twenty-one million, four hundred fifty-five thousand, four hundred forty-two".