1551615651641 has 4 divisors (see below), whose sum is σ = 1692671619984. Its totient is φ = 1410559683300.

The previous prime is 1551615651613. The next prime is 1551615651697. The reversal of 1551615651641 is 1461565161551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1551615651641 - 2¹⁰ = 1551615650617 is a prime.

It is a super-2 number, since 2×1551615651641² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551615651841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70527984155 + ... + 70527984176.

It is an arithmetic number, because the mean of its divisors is an integer number (423167904996).

Almost surely, 2^{1551615651641} is an apocalyptic number.

1551615651641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1551615651641 is a deficient number, since it is larger than the sum of its proper divisors (141055968343).

1551615651641 is a wasteful number, since it uses less digits than its factorization.

1551615651641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141055968342.

The product of its digits is 540000, while the sum is 47.

The spelling of 1551615651641 in words is "one trillion, five hundred fifty-one billion, six hundred fifteen million, six hundred fifty-one thousand, six hundred forty-one".