601661555616 has 96 divisors (see below), whose sum is σ = 1813621017600. Its totient is φ = 172725799680.

The previous prime is 601661555611. The next prime is 601661555617. The reversal of 601661555616 is 616555166106.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-4 number, since 4×601661555616⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (601661555611) 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, 14973496 + ... + 15013623.

It is an arithmetic number, because the mean of its divisors is an integer number (18891885600).

Almost surely, 2^601661555616 is an apocalyptic number.

601661555616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

601661555616 is an abundant number, since it is smaller than the sum of its proper divisors (1211959461984).

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

601661555616 is a wasteful number, since it uses less digits than its factorization.

601661555616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29987162 (or 29987154 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 601661555616 in words is "six hundred one billion, six hundred sixty-one million, five hundred fifty-five thousand, six hundred sixteen".