1993515650971 has 16 divisors (see below), whose sum is σ = 2230676532000. Its totient is φ = 1768887203328.

The previous prime is 1993515650887. The next prime is 1993515650977. The reversal of 1993515650971 is 1790565153991.

It is a cyclic number.

It is not a de Polignac number, because 1993515650971 - 2⁷ = 1993515650843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993515650977) 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, 11561646 + ... + 11732803.

It is an arithmetic number, because the mean of its divisors is an integer number (139417283250).

Almost surely, 2^{1993515650971} is an apocalyptic number.

1993515650971 is a deficient number, since it is larger than the sum of its proper divisors (237160881029).

1993515650971 is a wasteful number, since it uses less digits than its factorization.

1993515650971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23294718.

The product of its (nonzero) digits is 11481750, while the sum is 61.

The spelling of 1993515650971 in words is "one trillion, nine hundred ninety-three billion, five hundred fifteen million, six hundred fifty thousand, nine hundred seventy-one".