61086967987 has 4 divisors (see below), whose sum is σ = 61139135656. Its totient is φ = 61034800320.

The previous prime is 61086967979. The next prime is 61086967993. The reversal of 61086967987 is 78976968016.

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 61086967987 - 2³ = 61086967979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61086967087) 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, 26082078 + ... + 26084419.

It is an arithmetic number, because the mean of its divisors is an integer number (15284783914).

Almost surely, 2^61086967987 is an apocalyptic number.

61086967987 is a deficient number, since it is larger than the sum of its proper divisors (52167669).

61086967987 is a wasteful number, since it uses less digits than its factorization.

61086967987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52167668.

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 61086967987 in words is "sixty-one billion, eighty-six million, nine hundred sixty-seven thousand, nine hundred eighty-seven".