261148703940 has 96 divisors (see below), whose sum is σ = 838671160320. Its totient is φ = 67393209600.

The previous prime is 261148703927. The next prime is 261148703947. The reversal of 261148703940 is 49307841162.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (261148703947) 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, 7783401 + ... + 7816880.

It is an arithmetic number, because the mean of its divisors is an integer number (8736157920).

Almost surely, 2^261148703940 is an apocalyptic number.

261148703940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261148703940 is an abundant number, since it is smaller than the sum of its proper divisors (577522456380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261148703940 is a wasteful number, since it uses less digits than its factorization.

261148703940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15600330 (or 15600322 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 261148703940 in words is "two hundred sixty-one billion, one hundred forty-eight million, seven hundred three thousand, nine hundred forty".