1261098551925 has 144 divisors (see below), whose sum is σ = 2371555210752. Its totient is φ = 664261041600.

The previous prime is 1261098551891. The next prime is 1261098551941. The reversal of 1261098551925 is 5291558901621.

1261098551925 is a `hidden beast` number, since 1 + 2 + 6 + 10 + 98 + 5 + 519 + 25 = 666.

It is not a de Polignac number, because 1261098551925 - 2⁶ = 1261098551861 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 225555880 + ... + 225561470.

It is an arithmetic number, because the mean of its divisors is an integer number (16469133408).

Almost surely, 2^{1261098551925} is an apocalyptic number.

1261098551925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1261098551925 is a deficient number, since it is larger than the sum of its proper divisors (1110456658827).

1261098551925 is a wasteful number, since it uses less digits than its factorization.

1261098551925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070 (or 6053 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 54.

The spelling of 1261098551925 in words is "one trillion, two hundred sixty-one billion, ninety-eight million, five hundred fifty-one thousand, nine hundred twenty-five".