1212453656557 has 16 divisors (see below), whose sum is σ = 1424537106048. Its totient is φ = 1017360751680.

The previous prime is 1212453656543. The next prime is 1212453656569. The reversal of 1212453656557 is 7556563542121.

It is not a de Polignac number, because 1212453656557 - 2²⁷ = 1212319438829 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 (1212453656507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1448863 + ... + 2126995.

It is an arithmetic number, because the mean of its divisors is an integer number (89033569128).

Almost surely, 2^{1212453656557} is an apocalyptic number.

It is an amenable number.

1212453656557 is a deficient number, since it is larger than the sum of its proper divisors (212083449491).

1212453656557 is a wasteful number, since it uses less digits than its factorization.

1212453656557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690660.

The product of its digits is 7560000, while the sum is 52.

The spelling of 1212453656557 in words is "one trillion, two hundred twelve billion, four hundred fifty-three million, six hundred fifty-six thousand, five hundred fifty-seven".