1500051655661 has 4 divisors (see below), whose sum is σ = 1615440244572. Its totient is φ = 1384663066752.

The previous prime is 1500051655649. The next prime is 1500051655681. The reversal of 1500051655661 is 1665561500051.

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

It can be written as a sum of positive squares in 2 ways, for example, as 323544816100 + 1176506839561 = 568810^2 + 1084669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500051655661 - 2²² = 1500047461357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1500051655681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57694294436 + ... + 57694294461.

It is an arithmetic number, because the mean of its divisors is an integer number (403860061143).

Almost surely, 2^{1500051655661} is an apocalyptic number.

It is an amenable number.

1500051655661 is a deficient number, since it is larger than the sum of its proper divisors (115388588911).

1500051655661 is a wasteful number, since it uses less digits than its factorization.

1500051655661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115388588910.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 1500051655661 in words is "one trillion, five hundred billion, fifty-one million, six hundred fifty-five thousand, six hundred sixty-one".