1987260051955 has 16 divisors (see below), whose sum is σ = 2578712423040. Its totient is φ = 1464453962752.

The previous prime is 1987260051943. The next prime is 1987260051961. The reversal of 1987260051955 is 5591500627891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1987260051955 - 2⁹ = 1987260051443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1987260051955.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248714410 + ... + 248722399.

It is an arithmetic number, because the mean of its divisors is an integer number (161169526440).

Almost surely, 2^{1987260051955} is an apocalyptic number.

1987260051955 is a deficient number, since it is larger than the sum of its proper divisors (591452371085).

1987260051955 is a wasteful number, since it uses less digits than its factorization.

1987260051955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497436878.

The product of its (nonzero) digits is 6804000, while the sum is 58.

The spelling of 1987260051955 in words is "one trillion, nine hundred eighty-seven billion, two hundred sixty million, fifty-one thousand, nine hundred fifty-five".