661419062304 has 384 divisors, whose sum is σ = 2406364692480. Its totient is φ = 153465753600.

The previous prime is 661419062261. The next prime is 661419062321. The reversal of 661419062304 is 403260914166.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2867962 + ... + 3089990.

It is an arithmetic number, because the mean of its divisors is an integer number (6266574720).

Almost surely, 2^661419062304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661419062304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203182346240).

661419062304 is an abundant number, since it is smaller than the sum of its proper divisors (1744945630176).

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

661419062304 is a wasteful number, since it uses less digits than its factorization.

661419062304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222104 (or 222096 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 661419062304 in words is "six hundred sixty-one billion, four hundred nineteen million, sixty-two thousand, three hundred four".