261575641534 has 4 divisors (see below), whose sum is σ = 392363462304. Its totient is φ = 130787820766.

The previous prime is 261575641519. The next prime is 261575641559. The reversal of 261575641534 is 435146575162.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65393910382 + ... + 65393910385.

It is an arithmetic number, because the mean of its divisors is an integer number (98090865576).

Almost surely, 2^261575641534 is an apocalyptic number.

261575641534 is a deficient number, since it is larger than the sum of its proper divisors (130787820770).

261575641534 is a wasteful number, since it uses less digits than its factorization.

261575641534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130787820769.

The product of its digits is 3024000, while the sum is 49.

The spelling of 261575641534 in words is "two hundred sixty-one billion, five hundred seventy-five million, six hundred forty-one thousand, five hundred thirty-four".