1151055661557 has 4 divisors (see below), whose sum is σ = 1534740882080. Its totient is φ = 767370441036.

The previous prime is 1151055661471. The next prime is 1151055661597. The reversal of 1151055661557 is 7551665501511.

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 not a de Polignac number, because 1151055661557 - 2²⁷ = 1150921443829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151055661597) 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, 191842610257 + ... + 191842610262.

It is an arithmetic number, because the mean of its divisors is an integer number (383685220520).

Almost surely, 2^{1151055661557} is an apocalyptic number.

It is an amenable number.

1151055661557 is a deficient number, since it is larger than the sum of its proper divisors (383685220523).

1151055661557 is an equidigital number, since it uses as much as digits as its factorization.

1151055661557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383685220522.

The product of its (nonzero) digits is 787500, while the sum is 48.

The spelling of 1151055661557 in words is "one trillion, one hundred fifty-one billion, fifty-five million, six hundred sixty-one thousand, five hundred fifty-seven".