1201994427515 has 16 divisors (see below), whose sum is σ = 1648763087040. Its totient is φ = 824067957120.

The previous prime is 1201994427499. The next prime is 1201994427539. The reversal of 1201994427515 is 5157244991021.

It is not a de Polignac number, because 1201994427515 - 2⁴ = 1201994427499 is a prime.

It is a super-2 number, since 2×1201994427515² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3079760 + ... + 3448029.

It is an arithmetic number, because the mean of its divisors is an integer number (103047692940).

Almost surely, 2^{1201994427515} is an apocalyptic number.

1201994427515 is a deficient number, since it is larger than the sum of its proper divisors (446768659525).

1201994427515 is an equidigital number, since it uses as much as digits as its factorization.

1201994427515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6533062.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 1201994427515 in words is "one trillion, two hundred one billion, nine hundred ninety-four million, four hundred twenty-seven thousand, five hundred fifteen".