61771532690 has 32 divisors (see below), whose sum is σ = 134547744384. Its totient is φ = 19932998400.

The previous prime is 61771532659. The next prime is 61771532717. The reversal of 61771532690 is 9623517716.

It is a happy number.

It is a super-2 number, since 2×61771532690² (a number of 22 digits) contains 22 as substring.

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, 25953236 + ... + 25955615.

It is an arithmetic number, because the mean of its divisors is an integer number (4204617012).

Almost surely, 2^61771532690 is an apocalyptic number.

61771532690 is an abundant number, since it is smaller than the sum of its proper divisors (72776211694).

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

61771532690 is a wasteful number, since it uses less digits than its factorization.

61771532690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51908882.

The product of its (nonzero) digits is 476280, while the sum is 47.

The spelling of 61771532690 in words is "sixty-one billion, seven hundred seventy-one million, five hundred thirty-two thousand, six hundred ninety".