61213678547 has 16 divisors (see below), whose sum is σ = 71838443712. Its totient is φ = 51076638720.

The previous prime is 61213678543. The next prime is 61213678573. The reversal of 61213678547 is 74587631216.

It is a cyclic number.

It is not a de Polignac number, because 61213678547 - 2² = 61213678543 is a prime.

It is a super-2 number, since 2×61213678547² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61213678495 and 61213678504.

It is not an unprimeable number, because it can be changed into a prime (61213678543) 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 15 ways as a sum of consecutive naturals, for example, 697538 + ... + 780375.

It is an arithmetic number, because the mean of its divisors is an integer number (4489902732).

Almost surely, 2^61213678547 is an apocalyptic number.

61213678547 is a deficient number, since it is larger than the sum of its proper divisors (10624765165).

61213678547 is a wasteful number, since it uses less digits than its factorization.

61213678547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478078.

The product of its digits is 1693440, while the sum is 50.

The spelling of 61213678547 in words is "sixty-one billion, two hundred thirteen million, six hundred seventy-eight thousand, five hundred forty-seven".