61731863290 has 8 divisors (see below), whose sum is σ = 111117353940. Its totient is φ = 24692745312.

The previous prime is 61731863257. The next prime is 61731863293. The reversal of 61731863290 is 9236813716.

It can be written as a sum of positive squares in 2 ways, for example, as 60315921649 + 1415941641 = 245593^2 + 37629^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 61731863290.

It is not an unprimeable number, because it can be changed into a prime (61731863293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3086593155 + ... + 3086593174.

Almost surely, 2^61731863290 is an apocalyptic number.

61731863290 is a deficient number, since it is larger than the sum of its proper divisors (49385490650).

61731863290 is a wasteful number, since it uses less digits than its factorization.

61731863290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6173186336.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 61731863290 in words is "sixty-one billion, seven hundred thirty-one million, eight hundred sixty-three thousand, two hundred ninety".