1515001421561 has 8 divisors (see below), whose sum is σ = 1536507071424. Its totient is φ = 1493500427440.

The previous prime is 1515001421533. The next prime is 1515001421567. The reversal of 1515001421561 is 1651241005151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1515001421561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1515001421567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505886 + ... + 1812711.

It is an arithmetic number, because the mean of its divisors is an integer number (192063383928).

Almost surely, 2^{1515001421561} is an apocalyptic number.

It is an amenable number.

1515001421561 is a deficient number, since it is larger than the sum of its proper divisors (21505649863).

1515001421561 is an equidigital number, since it uses as much as digits as its factorization.

1515001421561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327871.

The product of its (nonzero) digits is 6000, while the sum is 32.

The spelling of 1515001421561 in words is "one trillion, five hundred fifteen billion, one million, four hundred twenty-one thousand, five hundred sixty-one".