1051551661551 has 4 divisors (see below), whose sum is σ = 1402068882072. Its totient is φ = 701034441032.

The previous prime is 1051551661507. The next prime is 1051551661579. The reversal of 1051551661551 is 1551661551501.

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 1051551661551 - 2¹⁴ = 1051551645167 is a prime.

It is a super-2 number, since 2×1051551661551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051551666551) 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, 175258610256 + ... + 175258610261.

It is an arithmetic number, because the mean of its divisors is an integer number (350517220518).

Almost surely, 2^{1051551661551} is an apocalyptic number.

1051551661551 is a deficient number, since it is larger than the sum of its proper divisors (350517220521).

1051551661551 is an equidigital number, since it uses as much as digits as its factorization.

1051551661551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350517220520.

The product of its (nonzero) digits is 112500, while the sum is 42.

The spelling of 1051551661551 in words is "one trillion, fifty-one billion, five hundred fifty-one million, six hundred sixty-one thousand, five hundred fifty-one".