61140666492 has 18 divisors (see below), whose sum is σ = 154550018168. Its totient is φ = 20380222152.

The previous prime is 61140666491. The next prime is 61140666533. The reversal of 61140666492 is 29466604116.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61140666491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 849175888 + ... + 849175959.

Almost surely, 2^61140666492 is an apocalyptic number.

It is an amenable number.

61140666492 is an abundant number, since it is smaller than the sum of its proper divisors (93409351676).

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

61140666492 is a wasteful number, since it uses less digits than its factorization.

61140666492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698351857 (or 1698351852 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 61140666492 in words is "sixty-one billion, one hundred forty million, six hundred sixty-six thousand, four hundred ninety-two".