1969450081020 has 36 divisors (see below), whose sum is σ = 5973998579640. Its totient is φ = 525186688224.

The previous prime is 1969450080977. The next prime is 1969450081021. The reversal of 1969450081020 is 201800549691.

1969450081020 is a `hidden beast` number, since 1 + 9 + 69 + 4 + 500 + 81 + 0 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1969450081021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5470694490 + ... + 5470694849.

It is an arithmetic number, because the mean of its divisors is an integer number (165944404990).

Almost surely, 2^{1969450081020} is an apocalyptic number.

1969450081020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1969450081020 is an abundant number, since it is smaller than the sum of its proper divisors (4004548498620).

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

1969450081020 is a wasteful number, since it uses less digits than its factorization.

1969450081020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10941389354 (or 10941389349 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 1969450081020 in words is "one trillion, nine hundred sixty-nine billion, four hundred fifty million, eighty-one thousand, twenty".