2151155002661 has 16 divisors (see below), whose sum is σ = 2515699152384. Its totient is φ = 1800922065264.

The previous prime is 2151155002603. The next prime is 2151155002721. The reversal of 2151155002661 is 1662005511512.

It is not a de Polignac number, because 2151155002661 - 2²⁶ = 2151087893797 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 (2151155002861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18279170 + ... + 18396476.

It is an arithmetic number, because the mean of its divisors is an integer number (157231197024).

Almost surely, 2^{2151155002661} is an apocalyptic number.

It is an amenable number.

2151155002661 is a deficient number, since it is larger than the sum of its proper divisors (364544149723).

2151155002661 is a wasteful number, since it uses less digits than its factorization.

2151155002661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178280.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 2151155002661 in words is "two trillion, one hundred fifty-one billion, one hundred fifty-five million, two thousand, six hundred sixty-one".