151221551556 has 48 divisors (see below), whose sum is σ = 356861292480. Its totient is φ = 49836193920.

The previous prime is 151221551549. The next prime is 151221551563. The reversal of 151221551556 is 655155122151.

It is an interprime number because it is at equal distance from previous prime (151221551549) and next prime (151221551563).

It is a super-2 number, since 2×151221551556² (a number of 23 digits) contains 22 as substring.

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, 477595 + ... + 728381.

It is an arithmetic number, because the mean of its divisors is an integer number (7434610260).

Almost surely, 2^151221551556 is an apocalyptic number.

It is an amenable number.

151221551556 is an abundant number, since it is smaller than the sum of its proper divisors (205639740924).

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

151221551556 is a wasteful number, since it uses less digits than its factorization.

151221551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251364 (or 251362 counting only the distinct ones).

The product of its digits is 75000, while the sum is 39.

The spelling of 151221551556 in words is "one hundred fifty-one billion, two hundred twenty-one million, five hundred fifty-one thousand, five hundred fifty-six".