197278401015 has 40 divisors (see below), whose sum is σ = 357900581808. Its totient is φ = 103947477120.

The previous prime is 197278401011. The next prime is 197278401017. The reversal of 197278401015 is 510104872791.

It is a happy number.

It is not a de Polignac number, because 197278401015 - 2² = 197278401011 is a prime.

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 (197278401011) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2900766 + ... + 2967995.

Almost surely, 2^197278401015 is an apocalyptic number.

197278401015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

197278401015 is a deficient number, since it is larger than the sum of its proper divisors (160622180793).

197278401015 is an equidigital number, since it uses as much as digits as its factorization.

197278401015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868861 (or 5868852 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 197278401015 in words is "one hundred ninety-seven billion, two hundred seventy-eight million, four hundred one thousand, fifteen".