1601561942137 has 4 divisors (see below), whose sum is σ = 1671195070080. Its totient is φ = 1531928814196.

The previous prime is 1601561942131. The next prime is 1601561942249. The reversal of 1601561942137 is 7312491651061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1601561942137 - 2¹⁹ = 1601561417849 is a prime.

It is a super-2 number, since 2×1601561942137² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601561942131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34816563937 + ... + 34816563982.

It is an arithmetic number, because the mean of its divisors is an integer number (417798767520).

Almost surely, 2^{1601561942137} is an apocalyptic number.

It is an amenable number.

1601561942137 is a deficient number, since it is larger than the sum of its proper divisors (69633127943).

1601561942137 is an equidigital number, since it uses as much as digits as its factorization.

1601561942137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69633127942.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 1601561942137 in words is "one trillion, six hundred one billion, five hundred sixty-one million, nine hundred forty-two thousand, one hundred thirty-seven".