161401016601 has 48 divisors (see below), whose sum is σ = 266075566848. Its totient is φ = 93402374400.

The previous prime is 161401016573. The next prime is 161401016639. The reversal of 161401016601 is 106610104161.

It is a happy number.

161401016601 is a `hidden beast` number, since 1 + 6 + 1 + 40 + 1 + 0 + 16 + 601 = 666.

It is not a de Polignac number, because 161401016601 - 2⁶ = 161401016537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161401016501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 232246 + ... + 613791.

It is an arithmetic number, because the mean of its divisors is an integer number (5543240976).

Almost surely, 2^161401016601 is an apocalyptic number.

161401016601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161401016601 is a deficient number, since it is larger than the sum of its proper divisors (104674550247).

161401016601 is a wasteful number, since it uses less digits than its factorization.

161401016601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846142 (or 846139 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 161401016601 in words is "one hundred sixty-one billion, four hundred one million, sixteen thousand, six hundred one".