61542666420 has 48 divisors (see below), whose sum is σ = 174891409728. Its totient is φ = 16166430720.

The previous prime is 61542666389. The next prime is 61542666421. The reversal of 61542666420 is 2466624516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61542666421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7650541 + ... + 7658580.

It is an arithmetic number, because the mean of its divisors is an integer number (3643571036).

Almost surely, 2^61542666420 is an apocalyptic number.

61542666420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61542666420 is an abundant number, since it is smaller than the sum of its proper divisors (113348743308).

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

61542666420 is a wasteful number, since it uses less digits than its factorization.

61542666420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15309200 (or 15309198 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 61542666420 in words is "sixty-one billion, five hundred forty-two million, six hundred sixty-six thousand, four hundred twenty".