1651515151551 has 4 divisors (see below), whose sum is σ = 2202020202072. Its totient is φ = 1101010101032.

The previous prime is 1651515151549. The next prime is 1651515151589. The reversal of 1651515151551 is 1551515151561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1651515151551 - 2¹ = 1651515151549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651515161551) 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, 275252525256 + ... + 275252525261.

It is an arithmetic number, because the mean of its divisors is an integer number (550505050518).

Almost surely, 2^{1651515151551} is an apocalyptic number.

1651515151551 is a deficient number, since it is larger than the sum of its proper divisors (550505050521).

1651515151551 is an equidigital number, since it uses as much as digits as its factorization.

1651515151551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550505050520.

The product of its digits is 93750, while the sum is 42.

The spelling of 1651515151551 in words is "one trillion, six hundred fifty-one billion, five hundred fifteen million, one hundred fifty-one thousand, five hundred fifty-one".