1551820061980 has 48 divisors (see below), whose sum is σ = 3371481630720. Its totient is φ = 599272708608.

The previous prime is 1551820061933. The next prime is 1551820062011. The reversal of 1551820061980 is 891600281551.

It is a happy number.

It is a super-2 number, since 2×1551820061980² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1551820061980.

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, 7117669 + ... + 7332451.

It is an arithmetic number, because the mean of its divisors is an integer number (70239200640).

Almost surely, 2^{1551820061980} is an apocalyptic number.

1551820061980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551820061980 is an abundant number, since it is smaller than the sum of its proper divisors (1819661568740).

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

1551820061980 is a wasteful number, since it uses less digits than its factorization.

1551820061980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227278 (or 227276 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 46.

The spelling of 1551820061980 in words is "one trillion, five hundred fifty-one billion, eight hundred twenty million, sixty-one thousand, nine hundred eighty".