1357912446778 has 4 divisors (see below), whose sum is σ = 2036868670170. Its totient is φ = 678956223388.

The previous prime is 1357912446721. The next prime is 1357912446829. The reversal of 1357912446778 is 8776442197531.

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

It can be written as a sum of positive squares in only one way, i.e., 1003617265249 + 354295181529 = 1001807^2 + 595227^2 .

It is a super-2 number, since 2×1357912446778² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339478111693 + ... + 339478111696.

Almost surely, 2^{1357912446778} is an apocalyptic number.

1357912446778 is a deficient number, since it is larger than the sum of its proper divisors (678956223392).

1357912446778 is an equidigital number, since it uses as much as digits as its factorization.

1357912446778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678956223391.

The product of its digits is 71124480, while the sum is 64.

The spelling of 1357912446778 in words is "one trillion, three hundred fifty-seven billion, nine hundred twelve million, four hundred forty-six thousand, seven hundred seventy-eight".