1535973906961 has 4 divisors (see below), whose sum is σ = 1654125745972. Its totient is φ = 1417822067952.

The previous prime is 1535973906941. The next prime is 1535973906967. The reversal of 1535973906961 is 1696093795351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 992095681600 + 543878225361 = 996040^2 + 737481^2 .

It is a cyclic number.

It is not a de Polignac number, because 1535973906961 - 2²⁷ = 1535839689233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1535973906893 and 1535973906902.

It is not an unprimeable number, because it can be changed into a prime (1535973906967) 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, 59075919486 + ... + 59075919511.

It is an arithmetic number, because the mean of its divisors is an integer number (413531436493).

Almost surely, 2^{1535973906961} is an apocalyptic number.

It is an amenable number.

1535973906961 is a deficient number, since it is larger than the sum of its proper divisors (118151839011).

1535973906961 is a wasteful number, since it uses less digits than its factorization.

1535973906961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118151839010.

The product of its (nonzero) digits is 41334300, while the sum is 64.

The spelling of 1535973906961 in words is "one trillion, five hundred thirty-five billion, nine hundred seventy-three million, nine hundred six thousand, nine hundred sixty-one".