61001605105 has 32 divisors (see below), whose sum is σ = 88324104960. Its totient is φ = 39510374400.

The previous prime is 61001605099. The next prime is 61001605109. The reversal of 61001605105 is 50150610016.

It is not a de Polignac number, because 61001605105 - 2²⁵ = 60968050673 is a prime.

It is a super-2 number, since 2×61001605105² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61001605105.

It is not an unprimeable number, because it can be changed into a prime (61001605109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88005 + ... + 360205.

It is an arithmetic number, because the mean of its divisors is an integer number (2760128280).

Almost surely, 2^61001605105 is an apocalyptic number.

It is an amenable number.

61001605105 is a deficient number, since it is larger than the sum of its proper divisors (27322499855).

61001605105 is a wasteful number, since it uses less digits than its factorization.

61001605105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272569.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 61001605105 in words is "sixty-one billion, one million, six hundred five thousand, one hundred five".