1551001521550 has 24 divisors (see below), whose sum is σ = 3106775356776. Its totient is φ = 572677484640.

The previous prime is 1551001521539. The next prime is 1551001521569. The reversal of 1551001521550 is 551251001551.

It is a happy number.

It is a super-2 number, since 2×1551001521550² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1193077444 + ... + 1193078743.

It is an arithmetic number, because the mean of its divisors is an integer number (129448973199).

Almost surely, 2^{1551001521550} is an apocalyptic number.

1551001521550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1551001521550 is an abundant number, since it is smaller than the sum of its proper divisors (1555773835226).

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

1551001521550 is a wasteful number, since it uses less digits than its factorization.

1551001521550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386156212 (or 2386156207 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 31.

The spelling of 1551001521550 in words is "one trillion, five hundred fifty-one billion, one million, five hundred twenty-one thousand, five hundred fifty".