61398132646 has 8 divisors (see below), whose sum is σ = 92280296304. Its totient is φ = 30638033880.

The previous prime is 61398132619. The next prime is 61398132659. The reversal of 61398132646 is 64623189316.

It is a happy number.

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

It is a super-2 number, since 2×61398132646² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61398132646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30514965 + ... + 30516976.

It is an arithmetic number, because the mean of its divisors is an integer number (11535037038).

Almost surely, 2^61398132646 is an apocalyptic number.

61398132646 is a deficient number, since it is larger than the sum of its proper divisors (30882163658).

61398132646 is a wasteful number, since it uses less digits than its factorization.

61398132646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61032446.

The product of its digits is 1119744, while the sum is 49.

The spelling of 61398132646 in words is "sixty-one billion, three hundred ninety-eight million, one hundred thirty-two thousand, six hundred forty-six".