61012820040 has 32 divisors (see below), whose sum is σ = 183038460480. Its totient is φ = 16270085312.

The previous prime is 61012820009. The next prime is 61012820051. The reversal of 61012820040 is 4002821016.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254219964 + ... + 254220203.

It is an arithmetic number, because the mean of its divisors is an integer number (5719951890).

Almost surely, 2^61012820040 is an apocalyptic number.

61012820040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61012820040 is an abundant number, since it is smaller than the sum of its proper divisors (122025640440).

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

61012820040 is a wasteful number, since it uses less digits than its factorization.

61012820040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508440181 (or 508440177 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The spelling of 61012820040 in words is "sixty-one billion, twelve million, eight hundred twenty thousand, forty".