1987326645915 has 32 divisors (see below), whose sum is σ = 3428988575040. Its totient is φ = 977041368576.

The previous prime is 1987326645839. The next prime is 1987326645937. The reversal of 1987326645915 is 5195466237891.

It is not a de Polignac number, because 1987326645915 - 2¹² = 1987326641819 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6808920 + ... + 7094789.

It is an arithmetic number, because the mean of its divisors is an integer number (107155892970).

Almost surely, 2^{1987326645915} is an apocalyptic number.

1987326645915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1987326645915 is a deficient number, since it is larger than the sum of its proper divisors (1441661929125).

1987326645915 is a wasteful number, since it uses less digits than its factorization.

1987326645915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13904463.

The product of its digits is 97977600, while the sum is 66.

The spelling of 1987326645915 in words is "one trillion, nine hundred eighty-seven billion, three hundred twenty-six million, six hundred forty-five thousand, nine hundred fifteen".