61515551067 has 4 divisors (see below), whose sum is σ = 82020734760. Its totient is φ = 41010367376.

The previous prime is 61515551021. The next prime is 61515551087. The reversal of 61515551067 is 76015551516.

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 61515551067 - 2⁷ = 61515550939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61515551087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10252591842 + ... + 10252591847.

It is an arithmetic number, because the mean of its divisors is an integer number (20505183690).

Almost surely, 2^61515551067 is an apocalyptic number.

61515551067 is a deficient number, since it is larger than the sum of its proper divisors (20505183693).

61515551067 is a wasteful number, since it uses less digits than its factorization.

61515551067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20505183692.

The product of its (nonzero) digits is 157500, while the sum is 42.

The spelling of 61515551067 in words is "sixty-one billion, five hundred fifteen million, five hundred fifty-one thousand, sixty-seven".