61531335506 has 4 divisors (see below), whose sum is σ = 92297003262. Its totient is φ = 30765667752.

The previous prime is 61531335487. The next prime is 61531335617. The reversal of 61531335506 is 60553313516.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 41454996025 + 20076339481 = 203605^2 + 141691^2 .

It is a super-2 number, since 2×61531335506² (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 61531335506.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 15382833875 + ... + 15382833878.

Almost surely, 2^61531335506 is an apocalyptic number.

61531335506 is a deficient number, since it is larger than the sum of its proper divisors (30765667756).

61531335506 is a wasteful number, since it uses less digits than its factorization.

61531335506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30765667755.

The product of its (nonzero) digits is 121500, while the sum is 38.

The spelling of 61531335506 in words is "sixty-one billion, five hundred thirty-one million, three hundred thirty-five thousand, five hundred six".