1961172307440 has 120 divisors (see below), whose sum is σ = 6620753887488. Its totient is φ = 520241134080.

The previous prime is 1961172307403. The next prime is 1961172307481. The reversal of 1961172307440 is 447032711691.

It is a happy number.

1961172307440 is a `hidden beast` number, since 1 + 9 + 6 + 1 + 172 + 30 + 7 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6992979 + ... + 7268018.

Almost surely, 2^{1961172307440} is an apocalyptic number.

1961172307440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961172307440 is an abundant number, since it is smaller than the sum of its proper divisors (4659581580048).

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

1961172307440 is a wasteful number, since it uses less digits than its factorization.

1961172307440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14261207 (or 14261198 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 1961172307440 in words is "one trillion, nine hundred sixty-one billion, one hundred seventy-two million, three hundred seven thousand, four hundred forty".