1597156993842 has 16 divisors (see below), whose sum is σ = 3304462746240. Its totient is φ = 514027538192.

The previous prime is 1597156993841. The next prime is 1597156993849. The reversal of 1597156993842 is 2483996517951.

It is not an unprimeable number, because it can be changed into a prime (1597156993841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4589531418 + ... + 4589531765.

It is an arithmetic number, because the mean of its divisors is an integer number (206528921640).

Almost surely, 2^{1597156993842} is an apocalyptic number.

1597156993842 is an abundant number, since it is smaller than the sum of its proper divisors (1707305752398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1597156993842 is a wasteful number, since it uses less digits than its factorization.

1597156993842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179063217.

The product of its digits is 146966400, while the sum is 69.

The spelling of 1597156993842 in words is "one trillion, five hundred ninety-seven billion, one hundred fifty-six million, nine hundred ninety-three thousand, eight hundred forty-two".