1551561149997 has 24 divisors (see below), whose sum is σ = 2373122302200. Its totient is φ = 973468492800.

The previous prime is 1551561149993. The next prime is 1551561150019. The reversal of 1551561149997 is 7999411651551.

1551561149997 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 5 + 611 + 4 + 9 + 9 + 9 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 459513159876 + 1092047990121 = 677874^2 + 1045011^2 .

It is not a de Polignac number, because 1551561149997 - 2² = 1551561149993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551561149993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2242747 + ... + 2851847.

It is an arithmetic number, because the mean of its divisors is an integer number (98880095925).

Almost surely, 2^{1551561149997} is an apocalyptic number.

1551561149997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1551561149997 is a deficient number, since it is larger than the sum of its proper divisors (821561152203).

1551561149997 is a wasteful number, since it uses less digits than its factorization.

1551561149997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625773 (or 625770 counting only the distinct ones).

The product of its digits is 15309000, while the sum is 63.

The spelling of 1551561149997 in words is "one trillion, five hundred fifty-one billion, five hundred sixty-one million, one hundred forty-nine thousand, nine hundred ninety-seven".