61251111021587 has 4 divisors (see below), whose sum is σ = 61626884709000. Its totient is φ = 60875337334176.

The previous prime is 61251111021557. The next prime is 61251111021647. The reversal of 61251111021587 is 78512011115216.

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

It is a cyclic number.

It is not a de Polignac number, because 61251111021587 - 2¹⁰ = 61251111020563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61251111021557) 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, 187886843462 + ... + 187886843787.

It is an arithmetic number, because the mean of its divisors is an integer number (15406721177250).

Almost surely, 2^{61251111021587} is an apocalyptic number.

61251111021587 is a deficient number, since it is larger than the sum of its proper divisors (375773687413).

61251111021587 is a wasteful number, since it uses less digits than its factorization.

61251111021587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375773687412.

The product of its (nonzero) digits is 33600, while the sum is 41.

The spelling of 61251111021587 in words is "sixty-one trillion, two hundred fifty-one billion, one hundred eleven million, twenty-one thousand, five hundred eighty-seven".