61211506530 has 32 divisors (see below), whose sum is σ = 146950905024. Its totient is φ = 16318258496.

The previous prime is 61211506519. The next prime is 61211506547. The reversal of 61211506530 is 3560511216.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 in 15 ways as a sum of consecutive naturals, for example, 196524 + ... + 401303.

It is an arithmetic number, because the mean of its divisors is an integer number (4592215782).

Almost surely, 2^61211506530 is an apocalyptic number.

61211506530 is an abundant number, since it is smaller than the sum of its proper divisors (85739398494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61211506530 is a wasteful number, since it uses less digits than its factorization.

61211506530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601250.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 61211506530 in words is "sixty-one billion, two hundred eleven million, five hundred six thousand, five hundred thirty".