1951989363990 has 32 divisors (see below), whose sum is σ = 5205304971360. Its totient is φ = 520530496992.

The previous prime is 1951989363977. The next prime is 1951989363991. The reversal of 1951989363990 is 993639891591.

1951989363990 is a `hidden beast` number, since 1 + 95 + 1 + 98 + 9 + 363 + 9 + 90 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951989363991) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3614794849 + ... + 3614795388.

It is an arithmetic number, because the mean of its divisors is an integer number (162665780355).

Almost surely, 2^{1951989363990} is an apocalyptic number.

1951989363990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1951989363990 is an abundant number, since it is smaller than the sum of its proper divisors (3253315607370).

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

1951989363990 is a wasteful number, since it uses less digits than its factorization.

1951989363990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7229590253 (or 7229590247 counting only the distinct ones).

The product of its (nonzero) digits is 127545840, while the sum is 72.

The spelling of 1951989363990 in words is "one trillion, nine hundred fifty-one billion, nine hundred eighty-nine million, three hundred sixty-three thousand, nine hundred ninety".