61989144350 has 72 divisors (see below), whose sum is σ = 135064812144. Its totient is φ = 20734848000.

The previous prime is 61989144311. The next prime is 61989144361. The reversal of 61989144350 is 5344198916.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 535670 + ... + 641030.

Almost surely, 2^61989144350 is an apocalyptic number.

61989144350 is an abundant number, since it is smaller than the sum of its proper divisors (73075667794).

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

61989144350 is a wasteful number, since it uses less digits than its factorization.

61989144350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105462 (or 105416 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 61989144350 in words is "sixty-one billion, nine hundred eighty-nine million, one hundred forty-four thousand, three hundred fifty".