1951219927440 has 160 divisors (see below), whose sum is σ = 7680992789760. Its totient is φ = 445993122816.

The previous prime is 1951219927351. The next prime is 1951219927451. The reversal of 1951219927440 is 447299121591.

1951219927440 is a `hidden beast` number, since 1 + 9 + 5 + 1 + 2 + 199 + 2 + 7 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64509349 + ... + 64539588.

It is an arithmetic number, because the mean of its divisors is an integer number (48006204936).

Almost surely, 2^{1951219927440} is an apocalyptic number.

1951219927440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1951219927440 is an abundant number, since it is smaller than the sum of its proper divisors (5729772862320).

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

1951219927440 is a wasteful number, since it uses less digits than its factorization.

1951219927440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129048966 (or 129048954 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 1951219927440 in words is "one trillion, nine hundred fifty-one billion, two hundred nineteen million, nine hundred twenty-seven thousand, four hundred forty".